Nr Electric Co., Ltd

Nr Engineering Co., Ltd

Zhongfeng Zhang

Haiying Li

Yeyuan Xie

Yu Wang

Dongming Cao

Jie Tian

Tiangui Jiang

Minglian Zhu

Chen Xie

Jian Ge

A multi-voltage level direct current grid system and a control protection method, the direct current grid system comprising: at least two direct current buses; at least one direct current transformer, one end of which is connected to a first direct current bus while another end is connected to a second direct current bus or a lead-out wire, which may achieve direct current voltage conversion; and at least one lead-out wire current limiter, one end of the lead-out wire current limiter being connected to the second direct current bus while another end is connected to the lead-out wire; the lead-out wire current limiter comprises a first current-limiting unit, and the first current limiting unit comprises a group of direct current switches, as well as a first bypass switch and a first current-limiting resistor unit that are connected in parallel.

Multi-voltage level direct current grid system and control protection method

A redundant energy acquisition circuit of a power module includes at least one power semiconductor device, a first capacitor, and a first bypass switch. The redundant energy acquisition circuit of the power module includes: a power supply board acquiring energy from the first capacitor, supplying power to a control board, and charging a discharge circuit. A first charging circuit has one end connected to a positive electrode of the first capacitor and another end connected to the discharge circuit, and charges the discharge circuit when the power supply board is not operating normally. The control board controls the discharge circuit to close. The discharge circuit discharges and triggers the first bypass switch to close after the discharge circuit is closed.

Redundant energy acquisition circuit of power module, and control method thereof

A bipolar bidirectional DC converter comprises at least two valve group series () and at least six magnetic elements (), and said valve group series are divided into a Type-I valve group series () and a Type-II valve group series () each valve group series () comprises a high-voltage DC port, a low-voltage DC port and at least three AC ports, and each AC port is connected to a magnetic element (); and the other ends of the magnetic elements (), which are connected to all the AC ports in the same valve group series (), are connected.

Bipolar bidirectional DC converter, and control method and control device therefor

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Jiangsu, China

Zhongfeng Zhang